[R-390] WA3KEY's Motorola R-390

[wli]

I could not agree more! There are a multitude of low-level interactions that most of us pay little attention to: lead placement for one. The list goes on and on. Not so important in the audio and pwr decks, but could be real important in the RF and IF decks, as Roger suggests. Small variances in leakage in critical circuits all add up to impact performance as a whole.

One fellow has even advocated runnning copper braid between all the ground points of an aluminum chassis, in an effort to eliminate ground loops.

I recall hearing of a Collins engineer who built his own R390A out of selected components out of the parts bin. It was said to perform marvelously. It was a retirement gift after years of service I heard. 

W. Li
Mercer Island